<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>05-H5自定义属性</title>
</head>
<body>
    <div id = "coco" getTime="getTime123" data-index="data-index" data-list-name="data-list-name"></div>

    <script>
        var div = document.querySelector('div');
        console.log(div.getAttribute('getTime'));

        /* 
            1. 约定大于规范，规范大于编码。自定义属性都以data-开头
            2. 返回值是一个对象。属性是data- 作为前缀
            3. 属性名 data- 默认省略，小驼峰
        */

        console.log(div.dataset);
        console.log(div.dataset.index);
        console.log(div.dataset.listName);
    </script>
</body>
</html>